In order to provide you with the most reliable and up-to-date thinking on this topic, I spent whole minutes on a single website doing some research. This one (in case you want to be an expert on the subject as I now am).
Here's the chart from the page:
However, I began to question the integrity and authority of this research when I couldn't find the sleeping positions of the other two humans with whom I share my life.
Luckily, this article has made me an expert in all things sleep personality-related. So I can give you some additional guidance. Let's start with Michael:
This sleeping position, known as The Burrow, says a person is warm-hearted and warm-blooded -- and can breathe through their feet. But mainly, it indicates this individual is not open for business between the hours of 11 PM and 6 AM. So if a baby cries, a dog pukes, a murderer breaks into the house, and your bedmate is a Burrower...you should be ready to get on as best you can.
And The Bean? What does her sleep position say?